80 Series Gearbox Noisy

Submitted: Monday, Apr 11, 2005 at 14:41
ThreadID: 21958 Views:1596 Replies:2 FollowUps:2
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G'day All
Got a 95 80 series which lately is starting to make a few noises in 5 th gear
only when i do 80-100 on the highway. I thought it may have been the tail shafts or uni joints.But the mechanic believes all is good in that department.Has anybody else experienced this problem. I am trying to get all the info, my vehicle has 1 year to go on its car yard warranty.so i can nip it in the bud.
Thanks
Don
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Reply By: Toy_Hilux - Monday, Apr 11, 2005 at 15:25

Monday, Apr 11, 2005 at 15:25
Hi Don,

We bought our 94 model back in 2000 and it also started making a few noises in the gearbox, mainly in second and third gears, also hard to get into and out of gear. Took it back while still under warranty also. The mechanic pulled the box to pieces and found that all the bearings needed replacing as well as all the gearing cogs. The meshing had worn therefore making the gearing sticky. Also, he found that the backlash in the rear diff also needed adjusting as there was noise there also. Lucky for the warranty.

Hope this helps.
AnswerID: 106156

Follow Up By: udm - Monday, Apr 11, 2005 at 16:12

Monday, Apr 11, 2005 at 16:12
Backlash adjusting? How do you adjust that? Dont you just replace the diff or the internal gears when its worn?

Ulises
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FollowupID: 363210

Follow Up By: Toy_Hilux - Monday, Apr 11, 2005 at 17:24

Monday, Apr 11, 2005 at 17:24
It is too much or lack of backlash that wears the teeth to start with (thats what our mechanic told us). Any good workshop manual gives directions on how to adjust this. Personally I prefer my mechanic doing this, that way if it is wrong, he cops the extra expense to fix it.
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FollowupID: 363217

Reply By: age - Tuesday, Apr 12, 2005 at 10:49

Tuesday, Apr 12, 2005 at 10:49
My 1990 GXL80 has had an very noisy gearbox from day 1. Gearbox pulled out 4 times under warranty, with new bearings, syncros, gears thrown at it each time - noise remained. Just live with it now (175000km of beach and heavy towing) and use Castrol Syntrax oil in it - makes a huge difference. Change gear oil every 12 months. Toyota also chucked on a new clutch slave cylider and made a huge difference for 12 months. One major warning - gearbox filler bung thread tapered and will crack housing if overtightened - do up finger tight and turn no more than a quarter more. This model gearbox very susceptible to angle of rear tail shaft, so if added aftermarket suspension or air bags, may add to problem. My problems used to go away with a decent load and some heavy work.
AnswerID: 106325

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